carputer on board soundcard

Hi eceryone, I did a little searching before posting this but couldnt find the answer. i just finished building a carpc and am using the intel atom D525MW motherboard with onboard sound card. this is installed in my 99 mercedes with factory bose amp. i used an PAC OEM 2 in reverse maner in order to have RCA plug ins to the speaker wires. everything works great except my base and volume are very low! so i was trying to find a solution for this and came up with a few things.

1. run a headunit which i dont have the room for so out of the question.

2. run an amp right out of the car pc into the pac oem 2 and then into the factory amp. i looked into a few cheapy amps because space is an issue for me and found a couple that are 300watts 4 channel. but is a 300 wat 4 chanel enough?

3. run a soundcard which i heard of the name sound blaster. i'm not sure about this option can someone elaborate on this a little more.

keep in mind im running factory speakers so i'm not looking for anything crazy just factory sound quality. Thank you very much in advanced.
3.

im confused on your wiring. i think what you're doing is taking your soundcard as if it's a speaker level output, inputing it into the pac oem2 and getting line level output... hooking that up to the amp? if that is the case then the pac oem2 isn't needed. your soundcard outputs line level so you should be able to just wire that directly to the amp.... but it's bose.... hmmm something isnt adding up

Scott is right, you shouldn't need to use a LOC at all. By using the LOC, you are reducing the signal voltage going into the factory amp because they are designed to take a high level signal and attenuate it to a low level signal that amp can take in. The computer soundcard is considered a low level signal, and the amp takes in a low level signal. make sense?

Thank you very much too all the friends for your responces, that makes perfect sense. I think this is what i am going to do. eliminate the pac oem 2 and plug in the rca,s coming out of the car pc into a 300wat 4 chanel mini amp and then connect that amp to the bose amp via the factory wiring and i think i will have myself a winner. here is the last question:

is the 300 wat 4 chanel amp enough? and is there a super small amp that you guys recomend?

areyousure, because this is my factory bose amp not a high powered aftermarket amp. while i had mt stereo out of my car i was using my ipod to listen to music and i had it hookedup to the bose amp directly without the pac oem 2 and the volume and base very super low, but i'm not sure fi that would be the case with the car pc as well i dont know if the onboard sound card is much stronger than the ipod or not.